#174B9D
Closest named color: Cobalt (#1E488F). oklch(42.9% 0.144 259.6), rgb(23, 75, 157).
Aa
White text reads best on this color (8.30:1).
About this color
#174B9D is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.144 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.024 away. White text reads best on it, at 8.30:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.52:1 |
| White text | 8.30:1 |
Values
| HEX | #174B9D |
| RGB | rgb(23, 75, 157) |
| HSL | hsl(217, 74%, 35%) |
| OKLCH | oklch(42.9% 0.144 259.6) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #174B9D | 8.30:1 | AAA | Lc -92.8 | Preferred for body text |
| Black text on #174B9D | 2.52:1 | Fails | Lc 15.9 | Dividers and decoration only |
| #174B9D text on white | 8.30:1 | AAA | Lc 88.1 | Fine for body text |
| #174B9D text on black | 2.52:1 | Fails | Lc -14.0 | Not readable |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 800.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C7DAF9
oklch(88.4% 0.048 260.2)
-
Step 300
300
#A1C2F8
oklch(80.9% 0.085 260.1)
-
Step 400
400
#6DA0F4
oklch(70.6% 0.135 260)
-
Step 500
500
#4586F0
oklch(63.1% 0.173 259.7)
-
Step 600
600
#256DDE
oklch(55.6% 0.187 259.6)
-
Step 700
700
#175AC1
oklch(49.1% 0.174 259.6)
-
Step 800
800 (this color)
#174B9D
oklch(42.9% 0.144 259.6)
-
Step 900
900
#193F7C
oklch(37.7% 0.112 259.6)
-
Step 950
950
#102549
oklch(26.9% 0.072 260.4)
#174B9D with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #1355A0 | 0.027 |
| Deuteranopia (no green cones) | #00489B | 0.015 |
| Tritanopia (no blue cones) | #005F6C | 0.111 |
| Achromatopsia (no color) | #4E4E4E | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #174B9D
#174B9D
oklch(42.9% 0.144 259.6)
- #694900
#694900
oklch(43% 0.089 79.8)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #174B9D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.024
- Dusk Blue #26538D ΔE 0.039
- Light Navy #155084 ΔE 0.046
- Sapphire #2138AB ΔE 0.051
- Blueberry #464196 ΔE 0.054
- Deep Sea Blue #015482 ΔE 0.056
- Twilight Blue #0A437A ΔE 0.062
- Light Navy Blue #2E5A88 ΔE 0.064
Use #174B9D in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.